Ericsson EDACS M-RK I, Руководство оператора, Страница: 30 / 76

AEGIS PRIVATE AND VOICE GUARD
PRIVATE MODES
The Aegis private and Voice Guard private modes
allow the radio to transmit encrypted messages and
receive clear or private transmissions. The radio will
transmit private if the group/channel is programmed for
private operation and forced operation is pre-pro-
grammed. If autoselect operation was pre-programmed
and the radio is in private mode, the radio will transmit in
the mode of the received call if the hang time is active. If
no hang time is active, the radio will transmit private.
Aegis transmissions cannot be received by a radio set
to receive a Voice Guard transmission. Accordingly, a
Voice Guard transmission cannot be received by a radio
set to receive an Aegis transmission.
Cryptographic keys are transferred to the radio using
a cryptographic Keyloader. Up to seven (7) different
cryptographic keys, numbered 1-7, can be transferred
from a Keyloader and stored in the radio. An individual
key is automatically selected on a per-group/channel
basis according to the radio’s programming. Groups and
channels within Aegis systems can be programmed for
keys 1-7. Groups and channels within Voice Guard sys-
tems can be programmed for keys 1-7. Up to 8 banks of
7 keys can be stored for Aegis (DES and VGE) systems
and up to 4 banks of 7 keys for Voice Guard systems. The
bank is specified per system.
DES radios require a DES Keyloader (Option V4025
with software version 3.N or later). VGE radios require a
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